@misc{watkins2010,
  title={Fondamentals of Matrix Computations - Third Edition},
  author={Watkins, DS},
  year={2010},
  publisher={Wiley}
}
@misc{horn2013,
  title={Matrix Analysis},
  author={Horn, RA and Johnson, CR},
  year={2013},
  publisher={Cambridge University Press.}
}
@misc{Shewchuk1994, 
title = {{An Introduction to the Conjugate Gradient Method Without the Agonizing Pain}}, 
author = {Shewchuk, J}, 
institution = {School of Computer Science, Carnegie Mellon University}, 
pages = {1-64}, 
year = {1994}
}
@misc{iserles2008,
  title={A First Course in the Numerical Analysis of Differential Equations - Second Edition},
  author={Iserles, A},
  year={2008},
  publisher={Cambridge University Press.}
}